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          <h1 class="post-title" itemprop="name headline">sass常用语法整理</h1>
        

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        <p>体验一把css的模块化。首先从scss语法开始。</p>
<h4 id="声明变量与默认变量。"><a href="#声明变量与默认变量。" class="headerlink" title="声明变量与默认变量。"></a>声明变量与默认变量。</h4><p>默认变量可以被重新赋值。</p>
<blockquote>
<p>如果用户在局部文件中导入了变量,但是又在文件中重新声明了变量,则局部文件中的变量将会失效。</p>
</blockquote>
<figure class="highlight scss"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="variable">$primary-color</span>: red;</span><br><span class="line"><span class="variable">$primary-color</span>: red !default;</span><br></pre></td></tr></table></figure>

<h4 id="导入文件"><a href="#导入文件" class="headerlink" title="导入文件"></a>导入文件</h4><ol>
<li><h5 id="嵌套导入"><a href="#嵌套导入" class="headerlink" title="嵌套导入"></a>嵌套导入</h5><p> css的import会在使用的时候再去下载引入的文件,而sass则会把import的内容编译到同一个css文件中.</p>
</li>
<li><h5 id="局部文件"><a href="#局部文件" class="headerlink" title="局部文件"></a>局部文件</h5><p> 专门为<code>@import</code>使用的文件称为局部文件,局部文件的文件名以下划线开头.</p>
</li>
</ol>
<h4 id="注释"><a href="#注释" class="headerlink" title="注释"></a>注释</h4><h4 id="继承"><a href="#继承" class="headerlink" title="继承"></a>继承</h4><figure class="highlight scss"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="selector-class">.error</span>&#123;</span><br><span class="line">    <span class="attribute">color</span>:red;</span><br><span class="line">&#125;</span><br><span class="line"><span class="selector-class">.text</span>&#123;</span><br><span class="line">    @<span class="keyword">extend</span>: .error;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>上述语法可以理解为将<code>class=&quot;text&quot;</code>的样式改成<code>class=&quot;text error&quot;</code>,继承是基于语义化而不是基于属性的,这是与混合的区别,混合是基于属性的.<br>继承的重复属性是基于css权重生效的.<br>不要在后代选择器中使用继承,容易导致选择器数量失控</p>

      
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              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-4"><a class="nav-link" href="#声明变量与默认变量。"><span class="nav-number">1.</span> <span class="nav-text">声明变量与默认变量。</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#导入文件"><span class="nav-number">2.</span> <span class="nav-text">导入文件</span></a><ol class="nav-child"><li class="nav-item nav-level-5"><a class="nav-link" href="#嵌套导入"><span class="nav-number">2.1.</span> <span class="nav-text">嵌套导入</span></a></li><li class="nav-item nav-level-5"><a class="nav-link" href="#局部文件"><span class="nav-number">2.2.</span> <span class="nav-text">局部文件</span></a></li></ol></li><li class="nav-item nav-level-4"><a class="nav-link" href="#注释"><span class="nav-number">3.</span> <span class="nav-text">注释</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#继承"><span class="nav-number">4.</span> <span class="nav-text">继承</span></a></li></ol></div>
            

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